Potential of an Insect Growth Regulator in the Management of the Rice Moth Corcyra Cephalonica Stainton, 1866 (Lepidoptera: Pyralidae)

Abstract

The present investigation reveals the influence of methoprene, an IGR, on the ontogeny, growth duration and adult longevity of the rice moth Corcyra cephalonica. Twenty-five larvae of different instars (1st, 2nd, 3rd and 4th) of C. cephalonica were exposed to the juvenile hormone analogue methoprene in order to evaluate its potential effect on larval mortality, pupation, pupal mortality, adult emergence, growth duration and adult longevity. These different instars larvae were treated with 2, 4, 8 and 12 ppm of methoprene in an artificial diet (coarsely ground jowar mixed with 5% yeast powder) where the control received acetone alone. The results reveal significant differences in all the parameters mentioned above as compared to the control.

Toxicity And Physiological Activity of Methoprene, A Juvenile Hormone Analog, Against Development and Metamorphosis of The Grey Flesh Fly, Parasarcophaga argyrostoma (Robineau- Desvoidy)(Diptera: Sarcophagidae).

“…In larvicidal activity of methoprene against P. argyrostoma, in the current study, was in corroboration with some reported results of methoprene larvicidal activity against some insects, such as the mosquito Culex molestus (Farghal and Temerak, 1981), the common house mosquito Culex pipiens (Gelbic et al, 2002), the Asian tiger mosquito Aedes albopictus (Khan et al, 2016), the black cutworm Agrotis ipsilon (Khatter, 2014) and C. cephalonica (Tripathi and Tiwari, 2006). Also, the present result of methoprene pupicidal activity against P. argyrostoma agreed with those reported pupicidal activity of methoprene against some insects, such as the yellow fever mosquito Aedes aegypti (Braga et al, 2005) and C. cephalonica (Tripathi and Tiwari, 2006). In addition, exposure of 3 rd instar larvae of the flesh fly Sarcophaga ruficornis to different concentrations of Barium carbonate resulted in larval and pupal mortalities (Singh et al, 2017).…”

“…The deformed adult flies were observed with a poor ability to fly. The present result agreed, also, with the reported anti-morphogenic activity of Methoprene against some of other insects, such as Sitotroga cerealella (Stockel and Edwards, 1981), T. confusum (Smet et al, 1989) and the rice moth Corcyra cephalonica (Tripathi and Tiwari, 2006). For interpretation of the anti-morphogenic action of Methoprene on the adult flies of P. argyrostoma, as appeared in adult deformities in the present study, this juvenoid might exert an adverse action on the hormonal balance during the adult differentiation, in particular the disturbance of ecdysteroid titre which led to changes in lysosomal enzyme activity causing overt morphological abnormalities (Josephrajkumar et al, 1999).…”

“…For examples, methoprene treatment of C. molestus larvae resulted in prolonged larval and pupal periods (Farghal and Temerak, 1981). After topical application of methoprene onto C. cephalonica larvae, the larval duration was prolonged (Tripathi and Tiwari, 2006). After topical application of methoprene onto larvae of B. mori 48h after 4 th larval ecdysis, duration of the 5 th (last) larval instar was prolonged (Miranda et al, 2002).…”

“…On the other hand, Methoprene was reported to inhibit the adult emergence after larval treatment of other insect species, such as C. molestus (Farghal and Temerak, 1981), the lesser mealworm Alphitobius diaperinus (Edwards and Abraham, 1985), Ae. aegypti (Braga et al, 2005), C. cephalonica (Tripathi and Tiwari, 2006), the southern house mosquito Culex quinquefasciatus and Ae. albopictus (Khan et al, 2016;Bibbs et al, 2017).…”

Assessment of toxic and developmental impacts of methoprene on the grey flesh fly Parasarcophaga argyrostoma (Diptera: Sarcophagidae)

“…Aedes albopictus (Khan et al, 2016), Agrotis ipsilon (Khatter, 2014) and C. cephalonica (Tripathi and Tiwari, 2006). Also, the current result of methoprene lethality against P. argyrostoma agreed with the pupicidal activity of methoprene against some insects, such as Aedes aegypti (Braga et al, 2005) and C.…”